滇中冷凉山区不同播期反季花椰菜产量效益分析     

李艳兰  张云明  李祥  胡新洲  段永华  刘坚坚  安正云  易丽华  蔡述江  王爱明  陶春红  史兰芬  李文静  杨进成 《农学学报》2021,11(9):58-63

为摸索滇中高海拔冷凉山区反季节栽培花椰菜的最佳播期以集成高效栽培技术推广应用,于2017—2018年选择海拔2250 m的云南省峨山县塔甸镇大西村地块进行9个播期的2年随机区组试验。结果表明,花椰菜生育期随播期推迟而延长,而花球采收期除播期7月10日外随播期推迟而逐渐增长;花椰菜株高、外叶数、开展度、球高、球径和单球重等农艺性状有随播期延迟呈现先逐渐减小而后又逐渐增大的趋势;莲座期黑腐病和霜霉病的病情指数随着播期的延迟呈现先逐渐升高而后又逐渐下降的趋势;花椰菜小区产量随着播期的延迟呈现先逐渐下降而后又逐渐提高的趋势,播期4月20日和4月30日与其余7个播期产量之间的差异达极显著水平。综合花椰菜在冷凉山区反季节栽培的生产实际和各播期产量产值及商品性表现,推荐滇中高海拔冷凉山区反季节栽培花椰菜的最佳播期为4月20—30日。  相似文献   

Effects of music stimulus on behavior response,cortisol level,and horizontal immunity of growing pigs     

Jiafang Li  Xiang Li  Honggui Liu  Jianhong Li  Qian Han  Chao Wang  Xiangyin Zeng  Yutao Li  Wenbo Ji  Runxiang Zhang  Jun Bao 《Journal of animal science》2021,99(5)

An enriched environment is widely used to improve domestic animals’ welfare and promote their natural behaviors. Music can reduce abnormal behavior in humans, nonhuman primates, and rodents. However, little is known about the effects of music on pigs. This study aims to explore the effects of repeated music stimulation on the behavior, physiology, and immunity of growing pigs. A total of 72 hybrid piglets (Large White × Duroc × Minpig) were randomly divided into three groups, including music (Mozart K.448, 60 to 70 dB), noise (recorded mechanical noise, 80 to 85 dB), and control (natural background sound, <40 dB), and 6 h sound stimulation was given per day (1000 to 1600 hours) from 40 to 100 d of age. The behavioral activities of the pigs were observed during the music stimulation, and their serum cortisol, salivary cortisol, and serum immune indices were also measured. Compared with the control group, the music group and noise group increased activity but decreased lying of pigs (P < 0.05). A significant increase in tail-wagging, playing, and exploring behaviors of pigs was found in the music group (P < 0.05), and the noise significantly increased the aggressive behavior of the pigs (P < 0.05). Tail-wagging, playing, exploring, manipulating, and aggressive behaviors decreased over time. Short-term (8 d) music stimulus had a lower cortisol level than that of the noise and control groups (P < 0.05), whereas long-term (60 d) music stimulus increased immunoglobulin G (IgG), interleukin-2 (IL-2), and interferon-gamma (IFN-γ) levels (P < 0.05) and decreased interleukin-4 (IL-4) level (P < 0.05). Long-term noise stimulus significantly reduced the level of IgG (P < 0.05) but did not affect the level of IL-2, IL-4, and IFN-γ levels (P > 0.05). In conclusion, short-term music stimulus (8 d) reduced the stress response, whereas long-term music stimulus (60 d) enhanced the immune responses. In addition, the noise increased the aggressive behavior, and long-term noise reduced the immunity of the growing pigs.  相似文献   

Effects of three methionine sources in diets on temporal B0AT1 and ASCT2 mRNA expression in different intestinal segments of cobia,Rachycentron canadum     

Yuanfa He  Shuyan Chi  Beiping Tan  Xiaohui Dong  Qihui Yang  Hongyu Liu  Shuang Zhang 《Journal of the World Aquaculture Society》2021,52(1):171-183

A 4‐week feeding trial was conducted using five groups of hybrid grouper (61.15 ± 0.15 g) to explore the potential effects of three methionine (Met) sources. Five isonitrogenous and isolipidic diets were formulated that included a fishmeal (FM) diet; nonsupplemented (NS) diet; or NS diets with the addition of the L‐methionine (L‐Met), DL‐methionine (DL‐Met), or coated Met (Co‐Met) to obtain the same Met level as the FM diet. Fish were randomly distributed into sea cages (30 fish per cage). Weight gain and specific growth rate in the DL‐Met group and FM group were significantly higher than those in all other groups (p < .05). In the proximal and distal intestines, of the 20 gene and time combinations (10 per gene), there were 14 combinations (70%) in which there were no significant differences in gene expression levels between the FM and DL‐Met groups (p > .05). The main reason for the same growth effect between the DL‐Met and FM groups may be attributed to the synchronized absorption at most time points after feeding, which had similar expression patterns of B⁰AT1 and ASCT2 of the proximal and distal intestines between two groups.  相似文献   

去雄对睡莲花瓣开放角度及生理生化特征的影响     

李兆基  霍少洁  周卫娟  鹿文举  陈彦甫  赵莹  王健 《分子植物育种》2021,19(21):7251-7257

为揭示睡莲(基部被子植物)的开花特性,探究雄蕊在睡莲花瓣节律性开放过程中的作用.本研究以蓝鸟睡莲(Nymphaea 'Blue Bird')为实验材料,在去雄(摘除雄蕊)后记录花瓣开放角度和萎蔫时间,并于去雄后第6、24、48及72小时测定花瓣的生理生化指标变化.结果 显示,去雄后睡莲花瓣的开放角度小于对照组,在第48小时与对照组开放角度差异最大,达到49.31°,而去雄后花瓣萎蔫的时间与对照组相同,均出现在第72小时;去雄引起了花瓣多项生理生化指标发生变化,其中,含水量在第24小时与72小时显著低于对照组,比对照组分别低0.7％与0.9％;可溶性糖含量变化显著,在第24小时和48小时比对照组分别高出0.48与0.68 mg/g;脯氨酸(Pro)含量在第72小时显著高于对照组;过氧化物酶(POD)活性从第24小时起比对照组显著升高;而丙二醛(MDA)含量则与对照组无明显差异.以上结果说明,去雄导致了睡莲花瓣开放角度及生理状态发生改变,该发现进一步地揭示了睡莲的开花特性,首次证明了雄蕊对于花瓣节律性开放具有调节作用,为花瓣开放闭合及切花保鲜等领域的研究提供了新的思路.  相似文献   

土壤团聚体有机碳研究进展   总被引：1，自引：0，他引：1  

朱锟恒  段良霞  李元辰  李振炜 《中国农学通报》2021,37(21):86-90

土壤有机碳是衡量土壤肥力的重要指标,对于促进土壤养分循环、增加养分有效性有重要作用。土壤团聚体是土壤的重要组成部分,是组成土壤结构的最小单元,受到自然因素和人为因素的影响,其形成转化过程与土壤固碳过程息息相关,因而研究团聚体和有机碳的关系及团聚体有机碳影响因素对于土壤结构的改善和土壤质量的提升具有重要意义。本文通过对文献的总结,明晰了土壤团聚体和有机碳的关系,阐述了土壤类型、施肥方式、土地利用和矿区复垦对土壤团聚体有机碳的影响,并从生物质炭的长期定位研究和复垦矿区的土壤修复两方面对土壤团聚体有机碳的研究进行展望,研究结果可为合理的农业生产提供科学依据。  相似文献   

OsbZIP09, a Unique OsbZIP Transcription Factor of Rice,Promotes Rather Than Suppresses Seed Germination by Attenuating Abscisic Acid Pathway     

Wang Chuxin  Zhu Chengchao  Zhou Yu  Xiong Min  Wang Jindong  Bai Huang  Lu Chenya  Zhang Changquan  Liu Qiaoquan  Li Qianfeng 《水稻科学》2021,28(4):358-367

  相似文献   

农机化司高度重视农机化产业链供应链自主稳定的信号     

朱礼好 《当代农机》2021,(1)

据农业农村部网站消息,2020年12月18日—21日,部农机化司组织开展2020年第4次理论学习中心组(扩大)学习。司领导班子及各处处长在深入学习领会党的十九届五中全会精神、认真研读《中共中央关于制定国民经济和社会发展第十四个五年规划和二〇三五年远景目标的建议》以及习近平总书记关于《建议》的说明基础上,紧紧围绕部党组关于粮食生产、农产品保供和推进农业现代化以及乡村建设等工作要求,梳理总结了2020年农机化工作情况,谋划提出了2021年重点任务。  相似文献   

马铃薯致病疫霉拮抗细菌研究进展     

高梦颖  付海燕  孙丛  王颜波  刘春光  马玉堃  杨峰山 《中国农学通报》2021,37(14):136-140

为了解决马铃薯致病疫霉侵染马铃薯导致其死亡,进而造成马铃薯单位种植产量低的问题。本文从拮抗菌入手,归纳分析细菌类拮抗菌中的主要拮抗菌中芽孢杆菌、假单胞菌和粘细菌对马铃薯致病疫霉的抑制作用。同时,在总结前人研究的基础上,笔者认为在拮抗菌应用方面,可以采用多对一的新型平板对峙筛菌模式来模拟复杂条件下拮抗菌的拮抗作用,以期得到稳定的拮抗菌;并指出应从定植能力和根际微生物影响方面对拮抗菌实际应用的可行性进行研究;此外,提出未来对拮抗菌抑制马铃薯致病疫霉的探究应从表型层面的研究深入到分子层面,以期能成功从源头找寻抑制马铃薯致病疫霉的答案。  相似文献   

食用向日葵产量性状的遗传研究     

杨海峰  段学艳  卫玲  刘博 《作物杂志》2020,36(5):93-7

以食葵不育系17-A26为母本、恢复系17-C19为父本,构建P₁、P₂、F₁、F₂、B₁和B₂ 6个世代群体,研究了产量相关性状盘径、单株总粒数、结实率、百粒重、粒长和粒宽的后代变异及遗传率。结果表明,6个性状均为数量性状,变异幅度排序为单株总粒数>粒长>盘径>结实率>百粒重>粒宽,狭义遗传率排序为百粒重>粒长>单株总粒数>粒宽>盘径>结实率。根据遗传进度结果,百粒重、粒长、单株总粒数和粒宽宜早代根据表型选择,盘径宜晚代选择,结实率宜晚代结合多环境联合选择。  相似文献   

玉米秸秆消化率全基因组关联分析     

林淼  张秋芝  史利玉  刘蓓  王红武  潘金豹 《作物杂志》2020,36(6):23-4

48h体外干物质消化率（48h in vitro dry matter digestibility, 48h IVDMD）是衡量青贮玉米品质的重要指标。为了初步探究玉米秸秆消化率的分子遗传机理,以341份玉米自交系为材料,于2018年在沈阳和通辽种植,收获后测定秸秆48h IVDMD。利用全基因组重测序获得的6 276 612个高质量SNPs进行全基因组关联分析,共检测到153个与玉米秸秆消化率显著相关的SNPs位点（P<1.0×10^-6）,4个SNPs显著水平在P<1.0×10^-8以上;共找到38个秸秆消化率的候选基因,主要涉及细胞生长发育、防御反应和信号转导等生物学功能。  相似文献